2-COLOR DYNAMIC LIGHT-SCATTERING
2-COLOR DYNAMIC LIGHT-SCATTERING
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DOI：
10.1080/09500349514551681
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发表时间：
1995-09-01
影响因子：
1.3
通讯作者：
PETERS, W
中科院分区：
文献类型：
--
作者：
SEGRE, PN;VANMEGEN, W;PETERS, W
本文描述了改进的双色动态光散射装置的设计、对准和操作，该装置有效地抑制了多次散射，并允许研究光学混浊样品的布朗动力学。这项技术是通过相互关联两种不同颜色的散射光来实现的。在适当的散射几何结构下，只有单个散射光对测量的强度互相关函数的时间相关部分有贡献，从而允许直接解释数据。为了证明仪器的性能，我们研究了各种胶体悬浮液。尽管稀释到可以假定颗粒的自由扩散，但样品的范围从相当透明到明显浑浊。我们已经证实，即使在存在强多次散射的情况下，测量的互相关函数也准确地反映了单次散射。
The design, alignment and operation of improved two-colour dynamic light scattering equipment which effectively suppresses multiple scattering and allows the study of the Brownian dynamics of optically turbid samples is described. The technique operates by cross-correlating scattered light of two different colours. With the appropriate scattering geometry, only singly scattered light contributes to the time-dependent part of the measured intensity cross-correlation function thus allowing straightforward interpretation of the data. To demonstrate the performance of the instrument we have studied various colloidal suspensions. Although dilute enough that free diffusion of the particles can be assumed, the samples ranged from quite transparent to distinctly turbid. We have confirmed that the measured cross-correlation functions accurately reflect only single scattering even in the presence of strong multiple scattering.